oiler

noun, a person who oils machinery (COD)

“There were a skipper, two mates, two wheelsmen … two watchmen, three deck hands. For aft you had two engineers, two oilers, three fireman, two cooks.”

“I worked on a deck for six months and then went to work in the engine room as an oiler, and I got a engineer’s license, and then I was on the Wolfe Islander II …. Once they made it a free ferry, the traffic increased dramatically.”